14 August. Friday 2026
Kawasaki KX450 - 2021 Specifications and Reviews
The 2021 Kawasaki KX450 is a competitive motocross bike engineered for serious off-road racers and experienced riders. Its liquid-cooled 449cc four-stroke engine delivers strong power through a manual clutch and five-speed transmission. Known for reliable performance and precise handling, the KX450 remains a top choice for amateur and professional motocross competition.
General information | |
| Price as new | Do you know this bike?Click here to rate it. We miss 1 vote to show the rating. |
| Category | Cross / motocross |
| Year | 2021 |
| Model | Kawasaki KX450 |
Engine and Transmission Specifications | |
| Clutch | Wet multi-disc, manual |
| Transmission type | Chain (final drive) |
| Gearbox | 5-speed |
| Cooling system | Liquid |
| Ignition | Digital CDI with 3 Coupler Options |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) |
| Fuel system | Injection. DFI® with 44mm Keihin throttle body |
| Bore x Stroke | 96.0 x 62.0 mm (3.8 x 2.4 inches) |
| Compression | 12.5:1 |
| Engine type | Single cylinder, four-stroke |
| Capacity: | 449.0 ccm (27.40 cubic inches) |
| | |
Brakes, suspension, Frame and wheels | |
| Rear brakes | Single disc. Single-piston caliper. |
| Diameter | 270 mm (10.6 inches) |
| Front brakes | Single disc. Semi-floating petal discs |
| Rear tire | 120/80-19 |
| Front tire | 80/100-21 |
| Rear wheel travel | 307 mm (12.1 inches) |
| Rear Suspension | Uni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed/19-way low-speed) compression damping, 38-way rebound damping and adjustable preload |
| Front wheel travel | 305 mm (12.0 inches) |
| Front Suspension | 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping |
| Trail | 122 mm (4.8 inches) |
| Rake (fork angle) | 27.6° |
| Frame type | Aluminum perimeter |
| | |
Physical measures and capacities | |
| Fuel capacity | 6.20 litres (1.64 US gallons) |
| Wheelbase | 1485 mm (58.5 inches) |
| Ground clearance | 340 mm (13.4 inches) |
| Overall width | 820 mm (32.3 inches) |
| Overall length | 2185 mm (86.0 inches) |
| Overall height | 1265 mm (49.8 inches) |
| Seat height | 955 mm (37.6 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 110.0 kg (242.5 pounds) |
| Dry weight | 105.6 kg (232.7 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Starter | Electric |
| Color options | Lime Green |
Performance Profile & Rider Fit
Best For
Track90%
City10%
Cornering85%
Daily Riding8%
Touring5%
Passenger0%
Rider Profile
| Best For | This is a full-blown motocross competition bike best suited to experienced off-road or motocross riders, not beginners or road riders. |
| Purpose | Built purely for motocross racing on closed circuits, jumps, and rough terrain rather than any form of street use. |
| Rider Fit | Its tall seat height, minimal weight, and aggressive ergonomics demand good rider fitness, strength, and off-road skill to control effectively. |
| Character | A razor-sharp, lightweight, high-revving dirt weapon that rewards aggressive, athletic riding with explosive agility over jumps and rough tracks. |
| Not Ideal For | It is not suitable for commuting, touring, passengers, or anyone seeking comfort, storage, or street-legal practicality. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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Rider Reviews
Total comments: 1
MotorcycleDB Review
The 2021 Kawasaki KX450 is an impressive off-road motorcycle that delivers top-of-the-line performance and handling. With its powerful 449cc engine and lightweight chassis, this bike is sure to please even the most discerning riders. The electric start system and advanced suspension make it easy to navigate through rough terrain, while the slim ergonomics provide a comfortable and natural feel. Whether you're tearing up the track or conquering the trails, the KX450 is a formidable and thrilling ride. In addition to its outstanding performance, the 2021 Kawasaki KX450 boasts a sleek and aggressive design that is sure to turn heads. The bold graphics and striking color options make for a visually stunning bike that exudes power and speed. With its combination of cutting-edge technology and standout aesthetics, the KX450 is a standout choice for anyone in the market for a high-performance off-road motorcycle. Whether you're a seasoned rider or a newcomer to the sport, the 2021 Kawasaki KX450 is a top contender that delivers on all fronts.Add a Comment
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